Hi tech table saw will never saw your finger off

I saw this on another site this morning and thought it was interesting.

The Sawstop system induces an electrical signal onto the blade and then monitors that signal for changes. The human body has a relatively large inherent electrical capacitance and conductivity- if the system detects this, the blade drops out in 5 miliseconds! Check out the video when the saw comes in contact with a hotdog.